During the process of road work, drop glass bead onto the road line painted with thermoplastic paint which is heated to certain temperature while the paint is still wet, thus to increase the reflectivity of road marking. According to the specification of Communication Industry Standard of the People`s Republic of China No. JT/T446-2001, the granulometry for drop on glass bead is shown in the table below:
Other parameters keep conformity with the type of intermix.
The glass bead can be produced based on the standard of countries or areas, such as EN1423/1424, AASHTO M247, BS6088, JIS R3301 and KS L2521 etc.
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2. Main methods for shortening the key route of the roadway engineering (1) If there is a wind well at the mine boundary, the main auxiliary shaft and the wind shaft can be digged in the head, and the through point is arranged at the junction of the transportation lane and the mountain.
(2) Where conditions permit, the measures can be excavated to shorten the length of the main contradiction line of the wells. However, it must be jointly studied by the construction and design units and submitted to the design approval unit for review and approval.
(3) Reasonable arrangement of project start-up sequence and construction content should actively adopt long-term and parallel cross-operation.
(4) Strengthen the allocation of resources, and put the construction teams with key teams and technical strengths on the main contradiction line construction.
(5) Do a good job in the construction preparation of various major contradictions on the line, give priority to personnel, equipment and equipment, and create the necessary material conditions for the uninterrupted construction of the main contradiction line.
(6) Strengthen the comprehensive balance of the main contradiction line construction, do a good job in the connection of various processes, solve the weak links, and reduce the auxiliary time to a minimum. 
1. The composition of the key route of mine roadway engineering In the mine roadway engineering, some of the coherent projects constitute the longest project in the whole mine construction, which forms a key route. Such as wellbore→bottom yard heavy-duty line→main stone gate→transportation alley→ mining area yard→ mining area uphill→ last mining area cutting roadway or wind tunneling roadway. The key route of the mine roadway determines the construction period of the mine.